All editions of CompleteFTP can be installed on cloud services such as Microsoft Azure and Amazon Web Services. Once a virtual machine has been created and remote desktop access to it has been obtained, installing CompleteFTP on it is no different to installing it on a local PC - you download the installer and run it. Of course, the cloud service's firewall will need to be configured appropriately to allow external users access to the server.
Licensing works like any other server installation. We are planning a modification of the licensing system to cater for those customers that regularly tear down and rebuild their virtual machines.